Analog Devices Inc. ADRF5721-EVALZ

Overview

ADRF5721-EVALZ from Analog Devices is a 4-layer evaluation board designed to characterize the ADRF5721 4-bit silicon digital attenuator (9 kHz–40 GHz, 2 dB LSB, 30 dB range) in real RF systems. It features 2.4 mm end-launch RF connectors (J1/J2), coplanar waveguide transmission lines (50 Ω), RO4003 dielectric stackup, and thru-calibration path (J3–J4) for de-embedding board loss.

For engineers reviewing the ADRF5721-EVALZ datasheet, ADRF5721-EVALZ pinout, ADRF5721-EVALZ application, or ADRF5721-EVALZ equivalent, this board enables accurate measurement of insertion loss, step error, return loss, and settling time across millimeter-wave frequencies - critical for 5G mmWave, test instrumentation, and radar system validation.

Technical Context

The ADRF5721-EVALZ implements a calibrated RF measurement platform with embedded 50 Ω CPWG traces (16 mil width, 6 mil ground clearance), 12 mil RO4003 top dielectric, and full ground planes on inner/bottom layers. It supports both serial (SPI) and parallel digital control via a 2×9-pin header (P1), with test points (TP1/TP2/TP4) for dual ±3.3 V supply and ground.

Thru calibration using J3–J4 allows removal of board-specific loss (typically −0.2 dB to −1.8 dB from 10–40 GHz), isolating true ADRF5721 device performance. The board accommodates hot-switching up to 26 dBm average RF input and integrates 100 pF bypass capacitors at VDD/VSS test points for stable biasing.

Key Specifications

Availability

ADRF5721-EVALZ is available at Aetrix Electronics and suitable for 5G millimeter wave infrastructure validation, microwave radio design, and electronic warfare test instrumentation requiring stable component supply and traceable RF evaluation hardware.

Supply support for ADRF5721-EVALZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and RF ICs, serving precision instrumentation, communications, and defense markets since 1965.

The ADRF5721-EVALZ belongs to Analog Devices' RF & Microwave Evaluation Platform family, engineered to accelerate development of ultrawideband RF components in demanding mmWave applications including 5G base stations and radar front-ends.

FAQ

What is the primary purpose of the ADRF5721-EVALZ evaluation board?

The ADRF5721-EVALZ evaluation board is specifically designed to facilitate accurate RF characterization of the ADRF5721 4-bit digital attenuator. It provides calibrated 2.4 mm RF interfaces, thru-line calibration capability, and full digital control access - enabling engineers to measure true device-level insertion loss, step accuracy, and settling time without PCB parasitic interference. This makes ADRF5721-EVALZ essential for validating ADRF5721 performance in 5G mmWave and test equipment designs.

Does the ADRF5721-EVALZ support both serial and parallel control modes for the ADRF5721 IC?

Yes, the ADRF5721-EVALZ fully supports both control modes. Digital signals for SPI (D4/SERIN, D5/CLK, LE) and parallel (D2–D5, PS, LE) are routed to a 2×9-pin header (P1), allowing direct connection to microcontrollers or FPGA development systems. The board's schematic and layout preserve signal integrity for both interfaces, and the PS pin is accessible to select mode - ensuring flexible integration during ADRF5721 prototyping and system-level testing.

How is RF calibration performed using the ADRF5721-EVALZ?

Calibration uses the dedicated thru path between unpopulated 2.4 mm launchers J3 and J4. By measuring S21 of this path, users obtain the frequency-dependent board loss profile (typically −0.2 dB to −1.8 dB from 10–40 GHz). This data is then applied in vector network analyzer (VNA) de-embedding to isolate the intrinsic ADRF5721 insertion loss and attenuation accuracy - a critical step for achieving measurement-grade results with ADRF5721-EVALZ.

What RF launchers are used on the ADRF5721-EVALZ, and why are they selected?

The ADRF5721-EVALZ uses Southwest Microwave 1492-04A-6 2.4 mm end-launch connectors (J1 and J2) for ATTIN and ATTOUT. These launchers are chosen for their validated performance up to 50 GHz, low reflection, and mechanical repeatability - ensuring minimal interface discontinuity when characterizing the ADRF5721 across its full 9 kHz–40 GHz bandwidth. Their non-soldered, contact-based mounting also simplifies replacement and maintains consistent launch impedance.

Can the ADRF5721-EVALZ be used for high-power RF testing?

The ADRF5721-EVALZ supports the ADRF5721's rated RF power handling: 26 dBm average and 30 dBm peak at ATTIN under proper thermal grounding. Its 4-layer stackup with extensive via fencing around RF traces and the exposed pad, plus RO4003's low-loss properties, ensures thermal stability and impedance integrity. However, sustained high-power operation requires external heat sinking or forced airflow - as the board itself is not actively cooled. Users must observe ADRF5721's derating curves above 85°C case temperature.